Sewing-machine.



'8. K. HOHMANN.

SEWING MACHlNE.

ATYl'oN FILED SEPT I9 AFPLC l 19'4- 1 ,1 98,547. Patented Sept. 19, 1916.

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rulli. ....l n l R. K. HOHMANN.

SEWING MACHINE.

APPucAnon man SEPTJQ. 1914.

Patented Sept. 19, 1916.

2 SHEETS-SHEET 2.

UNITED STATESA PATENT, oFFicE.

RIGHARDK. HOHMANN, OF BELVIDERE, ILLINOIS.

SEWING-MACHINE.

Specification of Letters Patent. i Patented Sept. 19, 1916.,

Application led September 19, 1914. Serial No. 862,587.

10 all whom t may concern Be it known that I, RICHARD K. Hori- MANN, a citizen of the United States, and resident of Belvidere, Boone county, State of Illinois, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification.

This invention relates to sewing machines in which the loop of thread is carried around the lower bobbin or spool by means of a. revolving hook.

It h'as particular reference to the means for retaining the spool holder against rotation as the loop passes around it.

The novel features of the invention will be apparent from the following description, taken in connection with the accompanying drawings in which,

Figure l is a face view of a sewing machine embodying my invention; Fig. 2 is a fragmentary bottom view of the same; Fig. 3 is a side view of the revolving hook mechanism including the spool holder; Fig. 4 is a vertical section of the structure shown in Fig. 3; Fig. 5 is a side view of the frame which carries the spool holder and around which the hook rotates; Fig. 6 is an edge view of the frame shown in Fig. 5.

As shown on these drawings, my invention is applied to a; sewing machine of a general type well known in the art and therefore in the present case it is not necessary to describe in detail any of the well known features which are shown. The machine includes the metal table 10 which is adapted to fit on the ordinary wooden table and which carries the working parts of the machine. It includes the usual hollow upright member 11, which supports the head 12 of the machine in which the needle bar 13 works vertically and in which the usual pressure foot bar 111 is mounted. The head 12 is provided with thread guides, the tension device 15 and the take-up arm 16.

Below the -top of the table and parallel therewith is a rotary shaft 17 which may be turned in any well known manner. At its forward end, where the needle passes down through the needle plate 18, the shaft 17 carries a circular head 19, which is in the shape of aI ring having its surface parallel to the shaft 17 and a peripheral flange 20 at the rear edge of this ring-like portion, and these parts are connected to the shaft 17 -by a flaring portion 21. The revolving hook-ring 22 fits on the circular head 19 and is secured thereto by suitable fastening means, such as the screws 23. The revolving ring 22 has on its edge the hook 24 for engaging the loop of the thread and there is an interior flange 25 at the forward edge ofthis ring, this flange cooperating with the forward edge of the circular head 19 to form a groove which receives the bearing rim of the frame 26, which carries the spool or bobbin holder. This makes a4 construction which is not only an efficient andv durable mechanism, but one which can be readily made and in which the parts can be assembled without trouble.

The frame 26 has a pin 27 pivoted thereto so that this pin can lie within the plane of the bearing rim on the frame 26 or can be turned outward to an inclined position permitting the insertion or removal of the spool holder 28. The spool holder 28 is provided with a central hollow shaft 29 adapted to fit over the pin 27 and having on its bottom a flange 30, which prevents the spool holder from turning' on the pin 27. In the upper end of the hollow shaft 29 is a pin 31, which is supported by a spring 32 and guided by means of a bushing 33 secured in the end of the hollow shaft. Thepin 31 coperates with a depression in the projection 34 on the inner face of the frame 26 so as to yieldingly hold the spool holder and the pin 27 in operative position, as shown in Fig. 4. It will, of co-urse, be understood that a, spool of thread is placed over the hollow shaft 29 and it will be seen that when the spool holder is in the position shown in Fig. 4 it is ready for operation. The spool holder is, of course, provided with the necessary thread guiding slots and the usual tension plate.

Since the frame 26 carrying the spool holder rests loosely within the revolving hook ring 22, it is clear that some means must be provided for preventing the rotation of the frame as the loop of thread is carried around it by the hook 24. For this purpose, a bar 35 is secured on the under side of the table 10 and is provided with a notch 36, which receives the outer end of a finger 37 secured to the frame 26. A spring 38 is secured in the finger 37 and normally engages the side 39 of the notch 36 so as to hold the frame 26 against rotation. The spring 38 enables the take-up arm 16 to draw the loop between the end of the finger 37 and the part 39 of the bar 35 without too much friction or resistance.

In the operation of the mechanism above described, the needle carries the thread through the opening 40 in the ring 22 and when the needle starts upward the loop which is left is caught by the hook 24 and carried over the hook 4l on the frame 26. One part of the loop being thus held by the hook 4l, the loop will be carried around the spool holder by the hook 24 as the latter revolves and when the hook 24 returns to a position adjacent the hook 41 the takeup arm will draw the loop between the spring 38 and the part 39.

Having thus described the invention,

what I claim, and desire to secure by Letters Patent is:

The combination of a revolving hook ring, a. bobbin-holding fra-me mounted therein, an arm secured to the side of the bobbin-holding frame and having its outer end bent away from the plane thereof, a spring secured to said arm and adapted to guide the thread, and a stationary bar having a notch into which said arm projects and which coperates with said bobbin-holding frame to hold the latter against rotation.

In testimony whereof I aiiX my signature in presence of two witnesses.

RICHARD K. HOHMANN. Witnesses:

WILLIAM L. PIERCE, ALEXANDER STRoM.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Iatents,

Washington, I" C. 

